【摘要】 应用大鼠游离胃窦平滑肌细胞 ,观察胃动素和胃泌素对胃窦平滑肌细胞收缩作用的胞内信号转导通路。结果显示 :(1)胃动素和胃泌素对胃窦平滑肌细胞均有收缩作用 ;(2 )Gαi 3 抗体可抑制胃动素和胃泌素加强胃窦平滑肌细胞的收缩 ,胃动素、胃泌素明显增加Gαi 3 抗体与 [35S]GTPγS的结合 ;(3)磷脂酶C抑制剂U 7312 2、三磷酸肌醇受体拮抗剂肝素可抑制胃动素和胃泌素引起的胃窦平滑肌细胞的收缩。结果表明 :胃动素和胃泌素通过兴奋与磷脂酶C耦联的Gi 蛋白 ,产生三磷酸肌醇 ,激发胃窦平滑肌细胞的收缩反应。更多还原

【Abstract】 Signal transduction pathway that mediates motilin and gastrin induced contraction of antral smooth muscle cells was investigated in rats. The results are as follows. (1) Motilin and gastrin induced contraction of isolated gastric smooth muscle cells in a dose dependent manner. (2) Motilin and gastrin induced antral smooth muscle cell contraction was inhibited by antibodies against G αi 3 . Motilin and gastrin caused an increase of Guanosine 5′ (3 [ 35 S]thio)triphosphate([ 35 S]GTPγS) binding of G αi 3 . (3) Contraction of antral muscle cells induced by motilin and gastrin was inhibited by the phospholipase C (PLC) inhibitor U 73122 and the IP 3 receptor antagonist heparin. The results suggest that motilin and gastrin induced contraction of rat antral smooth muscle cells is mediated by stimulating G i protein coupled with PLC that produces IP 3. [WT5HZ]更多还原